Guaiazulene

What is Guaiazulene?

Guaiazulene is a naturally occurring sesquiterpene hydrocarbon characterized by its intense blue color, primarily derived from the essential oils of chamomile species like Matricaria recutita and Chamaemelum nobile, as well as guaiac wood from Bulnesia sarmientoi trees. Belonging to the azulene class of bicyclic compounds, it exhibits notable chemical stability and aromatic qualities. In cosmetic products such as creams, lotions, serums, and shampoos, it functions by delivering a vibrant pigment for visual enhancement, contributing subtle woody or herbal notes to the scent profile, and exerting mild inhibitory effects against microbial proliferation to support formula stability and skin surface balance.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1-4 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Colorant
Provides or corrects color using dyes or pigments, helping achieve a consistent shade and visual appearance across batches and throughout wear.
Fragrance ingredient
Contributes scent character and/or masks base odors, shaping the overall sensory experience of the formula (subject to allergen and IFRA considerations).
Antimicrobial agent
Helps limit growth of bacteria and other microbes on skin or in the formula; may be used for product protection, odor control, or targeted antimicrobial effects.

Benefits

Provides a stable blue pigmentation for consistent product appearance.

Adds mild fragrance notes to improve sensory qualities.

Supports antimicrobial activity to help preserve product integrity.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
People seeking natural colorants in gentle skincare formulations.
Those allergic to chamomile or related Asteraceae plants.
Individuals preferring products with plant-derived scents.
People sensitive to fragrance components.
Users of multi-functional ingredients for everyday skin maintenance.
Individuals with known reactions to sesquiterpenes.

Safety Notes

  • Non-comedogenic with a rating of 0, suitable for acne-prone skin.
  • EWG hazard scores range from 1 to 4, indicating low concern.

Frequently Asked Questions about Guaiazulene

What is guaiazulene derived from?

It comes from essential oils of chamomile plants and guaiac wood.

Is guaiazulene safe for sensitive skin?

It is generally well-tolerated with low irritation potential, but patch test if concerned.

What roles does it play in products?

Colorant for blue hues, fragrance for scent, and antimicrobial for preservation.